CVE-2021-47631 (GCVE-0-2021-47631)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:54 – Updated: 2026-05-11 13:58
VLAI
Title
ARM: davinci: da850-evm: Avoid NULL pointer dereference
Summary
In the Linux kernel, the following vulnerability has been resolved: ARM: davinci: da850-evm: Avoid NULL pointer dereference With newer versions of GCC, there is a panic in da850_evm_config_emac() when booting multi_v5_defconfig in QEMU under the palmetto-bmc machine: Unable to handle kernel NULL pointer dereference at virtual address 00000020 pgd = (ptrval) [00000020] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT ARM Modules linked in: CPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1 Hardware name: Generic DT based system PC is at da850_evm_config_emac+0x1c/0x120 LR is at do_one_initcall+0x50/0x1e0 The emac_pdata pointer in soc_info is NULL because davinci_soc_info only gets populated on davinci machines but da850_evm_config_emac() is called on all machines via device_initcall(). Move the rmii_en assignment below the machine check so that it is only dereferenced when running on a supported SoC.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:51 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: bae105879f2f2404155da6f50b3636193d228a62 , < c06f476e5b74bcabb8c4a2fba55864a37e62843b (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < a12b356d45cbb6e8a1b718d1436b3d6239a862f3 (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < c64e2ed5cc376e137e572babfd2edc38b2cfb61b (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < 89931d4762572aaee6edbe5673d41f8082de110f (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < 0a312ec66a03133d28570f07bc52749ccfef54da (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < 0940795c6834fbe7705acc5c3d4b2f7a5f67527a (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < c5628533a3ece64235d04fe11ec44d2be99e423d (git)
Affected: bae105879f2f2404155da6f50b3636193d228a62 , < 83a1cde5c74bfb44b49cb2a940d044bb2380f4ea (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.33
Unaffected: 0 , < 2.6.33 (semver)
Unaffected: 4.9.311 , ≤ 4.9.* (semver)
Unaffected: 4.14.276 , ≤ 4.14.* (semver)
Unaffected: 4.19.239 , ≤ 4.19.* (semver)
Unaffected: 5.4.190 , ≤ 5.4.* (semver)
Unaffected: 5.10.112 , ≤ 5.10.* (semver)
Unaffected: 5.15.35 , ≤ 5.15.* (semver)
Unaffected: 5.17.4 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: davinci: da850-evm: Avoid NULL pointer dereference\n\nWith newer versions of GCC, there is a panic in da850_evm_config_emac()\nwhen booting multi_v5_defconfig in QEMU under the palmetto-bmc machine:\n\nUnable to handle kernel NULL pointer dereference at virtual address 00000020\npgd = (ptrval)\n[00000020] *pgd=00000000\nInternal error: Oops: 5 [#1] PREEMPT ARM\nModules linked in:\nCPU: 0 PID: 1 Comm: swapper Not tainted 5.15.0 #1\nHardware name: Generic DT based system\nPC is at da850_evm_config_emac+0x1c/0x120\nLR is at do_one_initcall+0x50/0x1e0\n\nThe emac_pdata pointer in soc_info is NULL because davinci_soc_info only\ngets populated on davinci machines but da850_evm_config_emac() is called\non all machines via device_initcall().\n\nMove the rmii_en assignment below the machine check so that it is only\ndereferenced when running on a supported SoC."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ARM: davinci: da850-evm: Evitar la desreferencia de puntero NULL Con versiones m\u00e1s nuevas de GCC, hay un p\u00e1nico en da850_evm_config_emac() al iniciar multi_v5_defconfig en QEMU bajo la m\u00e1quina palmetto-bmc: No se puede manejar la desreferencia de puntero NULL del kernel en la direcci\u00f3n virtual 00000020 pgd = (ptrval) [00000020] *pgd=00000000 Error interno: Oops: 5 [#1] PREEMPT M\u00f3dulos ARM vinculados: CPU: 0 PID: 1 Comm: swapper No contaminado 5.15.0 #1 Nombre del hardware: Sistema gen\u00e9rico basado en DT La PC est\u00e1 en da850_evm_config_emac+0x1c/0x120 LR est\u00e1 en El puntero emac_pdata en soc_info es NULL porque davinci_soc_info solo se completa en m\u00e1quinas davinci, pero se llama a da850_evm_config_emac() en todas las m\u00e1quinas a trav\u00e9s de device_initcall(). Mueva la asignaci\u00f3n rmii_en debajo de la verificaci\u00f3n de la m\u00e1quina para que solo se desreferencia cuando se ejecuta en un SoC compatible."
          }
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      "current_release_date": "2026-11-05T08:49:28+00:00",
      "cve": "CVE-2021-47631",
      "id": "CVE-2021-47631",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "200",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ARM: davinci: da850-evm: Avoid NULL pointer dereference",
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}



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